diff --git a/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios b/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
new file mode 100644
index 000000000000..a50553764654
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
@@ -0,0 +1,47 @@
+What:		/sys/bus/dfl/devices/dfl_dev.X/fec_mode
+Date:		Oct 2020
+KernelVersion:	5.11
+Contact:	Xu Yilun <yilun.xu@intel.com>
+Description:	Read-only. Returns the FEC mode of the 25G links of the
+		ethernet retimers configured by Nios firmware. "rs" for Reed
+		Solomon FEC, "kr" for Fire Code FEC, "no" for NO FEC.
+		"not supported" if the FEC mode setting is not supported, this
+		happens when the Nios firmware version major < 3, or no link is
+		configured to 25G.
+		Format: string
+
+What:		/sys/bus/dfl/devices/dfl_dev.X/retimer_A_mode
+Date:		Oct 2020
+KernelVersion:	5.11
+Contact:	Xu Yilun <yilun.xu@intel.com>
+Description:	Read-only. Returns the enumeration value of the working mode of
+		the retimer A configured by the Nios firmware. The value is
+		read out from shared registers filled by the Nios firmware. Now
+		the values could be:
+
+		- "0": Reset
+		- "1": 4x10G
+		- "2": 4x25G
+		- "3": 2x25G
+		- "4": 2x25G+2x10G
+		- "5": 1x25G
+
+		If the Nios firmware is updated in future to support more
+		retimer modes, more enumeration value is expected.
+		Format: 0x%x
+
+What:		/sys/bus/dfl/devices/dfl_dev.X/retimer_B_mode
+Date:		Oct 2020
+KernelVersion:	5.11
+Contact:	Xu Yilun <yilun.xu@intel.com>
+Description:	Read-only. Returns the enumeration value of the working mode of
+		the retimer B configured by the Nios firmware. The value format
+		is the same as retimer_A_mode.
+
+What:		/sys/bus/dfl/devices/dfl_dev.X/nios_fw_version
+Date:		Oct 2020
+KernelVersion:	5.11
+Contact:	Xu Yilun <yilun.xu@intel.com>
+Description:	Read-only. Returns the version of the Nios firmware in the
+		FPGA. Its format is "major.minor.patch".
+		Format: %x.%x.%x
diff --git a/MAINTAINERS b/MAINTAINERS
index 5fe658a6d846..c1012a23f05a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6892,7 +6892,7 @@ M:	Wu Hao <hao.wu@intel.com>
 R:	Tom Rix <trix@redhat.com>
 L:	linux-fpga@vger.kernel.org
 S:	Maintained
-F:	Documentation/ABI/testing/sysfs-bus-dfl
+F:	Documentation/ABI/testing/sysfs-bus-dfl*
 F:	Documentation/fpga/dfl.rst
 F:	drivers/fpga/dfl*
 F:	include/linux/dfl.h
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 5645226ca3ce..5ff9438b7b46 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -192,6 +192,17 @@ config FPGA_DFL_AFU
 	  to the FPGA infrastructure via a Port. There may be more than one
 	  Port/AFU per DFL based FPGA device.
 
+config FPGA_DFL_NIOS_INTEL_PAC_N3000
+	tristate "FPGA DFL NIOS Driver for Intel PAC N3000"
+	depends on FPGA_DFL
+	select REGMAP
+	help
+	  This is the driver for the N3000 Nios private feature on Intel
+	  PAC (Programmable Acceleration Card) N3000. It communicates
+	  with the embedded Nios processor to configure the retimers on
+	  the card. It also instantiates the SPI master (spi-altera) for
+	  the card's BMC (Board Management Controller).
+
 config FPGA_DFL_PCI
 	tristate "FPGA DFL PCIe Device Driver"
 	depends on PCI && FPGA_DFL
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index d8e21dfc6778..18dc9885883a 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -44,5 +44,7 @@ dfl-fme-objs += dfl-fme-perf.o
 dfl-afu-objs := dfl-afu-main.o dfl-afu-region.o dfl-afu-dma-region.o
 dfl-afu-objs += dfl-afu-error.o
 
+obj-$(CONFIG_FPGA_DFL_NIOS_INTEL_PAC_N3000)	+= dfl-n3000-nios.o
+
 # Drivers for FPGAs which implement DFL
 obj-$(CONFIG_FPGA_DFL_PCI)		+= dfl-pci.o
diff --git a/drivers/fpga/dfl-n3000-nios.c b/drivers/fpga/dfl-n3000-nios.c
new file mode 100644
index 000000000000..7a95366f6516
--- /dev/null
+++ b/drivers/fpga/dfl-n3000-nios.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DFL device driver for Nios private feature on Intel PAC (Programmable
+ * Acceleration Card) N3000
+ *
+ * Copyright (C) 2019-2020 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Wu Hao <hao.wu@intel.com>
+ *   Xu Yilun <yilun.xu@intel.com>
+ */
+#include <linux/bitfield.h>
+#include <linux/dfl.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/stddef.h>
+#include <linux/spi/altera.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+
+/*
+ * N3000 Nios private feature registers, named as NIOS_SPI_XX on spec.
+ * NS is the abbreviation of NIOS_SPI.
+ */
+#define N3000_NS_PARAM				0x8
+#define N3000_NS_PARAM_SHIFT_MODE_MSK		BIT_ULL(1)
+#define N3000_NS_PARAM_SHIFT_MODE_MSB		0
+#define N3000_NS_PARAM_SHIFT_MODE_LSB		1
+#define N3000_NS_PARAM_DATA_WIDTH		GENMASK_ULL(7, 2)
+#define N3000_NS_PARAM_NUM_CS			GENMASK_ULL(13, 8)
+#define N3000_NS_PARAM_CLK_POL			BIT_ULL(14)
+#define N3000_NS_PARAM_CLK_PHASE		BIT_ULL(15)
+#define N3000_NS_PARAM_PERIPHERAL_ID		GENMASK_ULL(47, 32)
+
+#define N3000_NS_CTRL				0x10
+#define N3000_NS_CTRL_WR_DATA			GENMASK_ULL(31, 0)
+#define N3000_NS_CTRL_ADDR			GENMASK_ULL(44, 32)
+#define N3000_NS_CTRL_CMD_MSK			GENMASK_ULL(63, 62)
+#define N3000_NS_CTRL_CMD_NOP			0
+#define N3000_NS_CTRL_CMD_RD			1
+#define N3000_NS_CTRL_CMD_WR			2
+
+#define N3000_NS_STAT				0x18
+#define N3000_NS_STAT_RD_DATA			GENMASK_ULL(31, 0)
+#define N3000_NS_STAT_RW_VAL			BIT_ULL(32)
+
+/* Nios handshake registers, indirect access */
+#define N3000_NIOS_INIT				0x1000
+#define N3000_NIOS_INIT_DONE			BIT(0)
+#define N3000_NIOS_INIT_START			BIT(1)
+/* Mode for retimer A, link 0, the same below */
+#define N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK	GENMASK(9, 8)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK	GENMASK(11, 10)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK	GENMASK(13, 12)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK	GENMASK(15, 14)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK	GENMASK(17, 16)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK	GENMASK(19, 18)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK	GENMASK(21, 20)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK	GENMASK(23, 22)
+#define N3000_NIOS_INIT_REQ_FEC_MODE_NO		0x0
+#define N3000_NIOS_INIT_REQ_FEC_MODE_KR		0x1
+#define N3000_NIOS_INIT_REQ_FEC_MODE_RS		0x2
+
+#define N3000_NIOS_FW_VERSION			0x1004
+#define N3000_NIOS_FW_VERSION_PATCH		GENMASK(23, 20)
+#define N3000_NIOS_FW_VERSION_MINOR		GENMASK(27, 24)
+#define N3000_NIOS_FW_VERSION_MAJOR		GENMASK(31, 28)
+
+/* The retimers we use on Intel PAC N3000 is Parkvale, abbreviated to PKVL */
+#define N3000_NIOS_PKVL_A_MODE_STS		0x1020
+#define N3000_NIOS_PKVL_B_MODE_STS		0x1024
+#define N3000_NIOS_PKVL_MODE_STS_GROUP_MSK	GENMASK(15, 8)
+#define N3000_NIOS_PKVL_MODE_STS_GROUP_OK	0x0
+#define N3000_NIOS_PKVL_MODE_STS_ID_MSK		GENMASK(7, 0)
+/* When GROUP MASK field == GROUP_OK  */
+#define N3000_NIOS_PKVL_MODE_ID_RESET		0x0
+#define N3000_NIOS_PKVL_MODE_ID_4X10G		0x1
+#define N3000_NIOS_PKVL_MODE_ID_4X25G		0x2
+#define N3000_NIOS_PKVL_MODE_ID_2X25G		0x3
+#define N3000_NIOS_PKVL_MODE_ID_2X25G_2X10G	0x4
+#define N3000_NIOS_PKVL_MODE_ID_1X25G		0x5
+
+#define N3000_NIOS_REGBUS_RETRY_COUNT		10000	/* loop count */
+
+#define N3000_NIOS_INIT_TIMEOUT			10000000	/* usec */
+#define N3000_NIOS_INIT_TIME_INTV		100000		/* usec */
+
+#define N3000_NIOS_INIT_REQ_FEC_MODE_MSK_ALL	\
+	(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK |	\
+	 N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK)
+
+#define N3000_NIOS_INIT_REQ_FEC_MODE_NO_ALL			\
+	(FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_NO))
+
+#define N3000_NIOS_INIT_REQ_FEC_MODE_KR_ALL			\
+	(FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_KR))
+
+#define N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL			\
+	(FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS) |		\
+	 FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK,	\
+		    N3000_NIOS_INIT_REQ_FEC_MODE_RS))
+
+struct n3000_nios {
+	void __iomem *base;
+	struct regmap *regmap;
+	struct device *dev;
+	struct platform_device *altera_spi;
+};
+
+static ssize_t nios_fw_version_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct n3000_nios *nn = dev_get_drvdata(dev);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%x.%x.%x\n",
+			  (u8)FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val),
+			  (u8)FIELD_GET(N3000_NIOS_FW_VERSION_MINOR, val),
+			  (u8)FIELD_GET(N3000_NIOS_FW_VERSION_PATCH, val));
+}
+static DEVICE_ATTR_RO(nios_fw_version);
+
+#define IS_MODE_STATUS_OK(mode_stat)					\
+	(FIELD_GET(N3000_NIOS_PKVL_MODE_STS_GROUP_MSK, (mode_stat)) ==	\
+	 N3000_NIOS_PKVL_MODE_STS_GROUP_OK)
+
+#define IS_RETIMER_FEC_SUPPORTED(retimer_mode)			\
+	((retimer_mode) != N3000_NIOS_PKVL_MODE_ID_RESET &&	\
+	 (retimer_mode) != N3000_NIOS_PKVL_MODE_ID_4X10G)
+
+static int get_retimer_mode(struct n3000_nios *nn, unsigned int mode_stat_reg,
+			    unsigned int *retimer_mode)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(nn->regmap, mode_stat_reg, &val);
+	if (ret)
+		return ret;
+
+	if (!IS_MODE_STATUS_OK(val))
+		return -EFAULT;
+
+	*retimer_mode = FIELD_GET(N3000_NIOS_PKVL_MODE_STS_ID_MSK, val);
+
+	return 0;
+}
+
+static ssize_t retimer_A_mode_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct n3000_nios *nn = dev_get_drvdata(dev);
+	unsigned int mode;
+	int ret;
+
+	ret = get_retimer_mode(nn, N3000_NIOS_PKVL_A_MODE_STS, &mode);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "0x%x\n", mode);
+}
+static DEVICE_ATTR_RO(retimer_A_mode);
+
+static ssize_t retimer_B_mode_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct n3000_nios *nn = dev_get_drvdata(dev);
+	unsigned int mode;
+	int ret;
+
+	ret = get_retimer_mode(nn, N3000_NIOS_PKVL_B_MODE_STS, &mode);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "0x%x\n", mode);
+}
+static DEVICE_ATTR_RO(retimer_B_mode);
+
+static ssize_t fec_mode_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	unsigned int val, retimer_a_mode, retimer_b_mode, fec_modes;
+	struct n3000_nios *nn = dev_get_drvdata(dev);
+	int ret;
+
+	/* FEC mode setting is not supported in early FW versions */
+	ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val);
+	if (ret)
+		return ret;
+
+	if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) < 3)
+		return sysfs_emit(buf, "not supported\n");
+
+	/* If no 25G links, FEC mode setting is not supported either */
+	ret = get_retimer_mode(nn, N3000_NIOS_PKVL_A_MODE_STS, &retimer_a_mode);
+	if (ret)
+		return ret;
+
+	ret = get_retimer_mode(nn, N3000_NIOS_PKVL_B_MODE_STS, &retimer_b_mode);
+	if (ret)
+		return ret;
+
+	if (!IS_RETIMER_FEC_SUPPORTED(retimer_a_mode) &&
+	    !IS_RETIMER_FEC_SUPPORTED(retimer_b_mode))
+		return sysfs_emit(buf, "not supported\n");
+
+	/* get the valid FEC mode for 25G links */
+	ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val);
+	if (ret)
+		return ret;
+
+	/*
+	 * FEC mode should always be the same for all links, as we set them
+	 * in this way.
+	 */
+	fec_modes = (val & N3000_NIOS_INIT_REQ_FEC_MODE_MSK_ALL);
+	if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_NO_ALL)
+		return sysfs_emit(buf, "no\n");
+	else if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_KR_ALL)
+		return sysfs_emit(buf, "kr\n");
+	else if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL)
+		return sysfs_emit(buf, "rs\n");
+
+	return -EFAULT;
+}
+static DEVICE_ATTR_RO(fec_mode);
+
+static struct attribute *n3000_nios_attrs[] = {
+	&dev_attr_nios_fw_version.attr,
+	&dev_attr_retimer_A_mode.attr,
+	&dev_attr_retimer_B_mode.attr,
+	&dev_attr_fec_mode.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(n3000_nios);
+
+static int n3000_nios_init_done_check(struct n3000_nios *nn)
+{
+	unsigned int val, state_a, state_b;
+	struct device *dev = nn->dev;
+	int ret, ret2;
+
+	/*
+	 * The SPI is shared by the Nios core inside the FPGA, Nios will use
+	 * this SPI master to do some one time initialization after power up,
+	 * and then release the control to OS. The driver needs to poll on
+	 * INIT_DONE to see when driver could take the control.
+	 *
+	 * Please note that after Nios firmware version 3.0.0, INIT_START is
+	 * introduced, so driver needs to trigger START firstly and then check
+	 * INIT_DONE.
+	 */
+
+	ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val);
+	if (ret)
+		return ret;
+
+	/*
+	 * If Nios version register is totally uninitialized(== 0x0), then the
+	 * Nios firmware is missing. So host could take control of SPI master
+	 * safely, but initialization work for Nios is not done. To restore the
+	 * card, we need to reprogram a new Nios firmware via the BMC chip on
+	 * SPI bus. So the driver doesn't error out, it continues to create the
+	 * spi controller device and spi_board_info for BMC.
+	 */
+	if (val == 0) {
+		dev_err(dev, "Nios version reg = 0x%x, skip INIT_DONE check, but the retimer may be uninitialized\n",
+			val);
+		return 0;
+	}
+
+	if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) >= 3) {
+		/* read NIOS_INIT to check if retimer initialization is done */
+		ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val);
+		if (ret)
+			return ret;
+
+		/* check if retimers are initialized already */
+		if (val & (N3000_NIOS_INIT_DONE | N3000_NIOS_INIT_START))
+			goto nios_init_done;
+
+		/* configure FEC mode per module param */
+		val = N3000_NIOS_INIT_START;
+
+		/*
+		 * When the retimer is to be set to 10G mode, there is no FEC
+		 * mode setting, so the REQ_FEC_MODE field will be ignored by
+		 * Nios firmware in this case. But we should still fill the FEC
+		 * mode field cause host could not get the retimer working mode
+		 * until the Nios init is done.
+		 *
+		 * For now the driver doesn't support the retimer FEC mode
+		 * switching per user's request. It is always set to Reed
+		 * Solomon FEC.
+		 *
+		 * The driver will set the same FEC mode for all links.
+		 */
+		val |= N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL;
+
+		ret = regmap_write(nn->regmap, N3000_NIOS_INIT, val);
+		if (ret)
+			return ret;
+	}
+
+nios_init_done:
+	/* polls on NIOS_INIT_DONE */
+	ret = regmap_read_poll_timeout(nn->regmap, N3000_NIOS_INIT, val,
+				       val & N3000_NIOS_INIT_DONE,
+				       N3000_NIOS_INIT_TIME_INTV,
+				       N3000_NIOS_INIT_TIMEOUT);
+	if (ret)
+		dev_err(dev, "NIOS_INIT_DONE %s\n",
+			(ret == -ETIMEDOUT) ? "timed out" : "check error");
+
+	ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_A_MODE_STS, &state_a);
+	if (ret2)
+		return ret2;
+
+	ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_B_MODE_STS, &state_b);
+	if (ret2)
+		return ret2;
+
+	if (!ret) {
+		/*
+		 * After INIT_DONE is detected, it still needs to check if the
+		 * Nios firmware reports any error during the retimer
+		 * configuration.
+		 */
+		if (IS_MODE_STATUS_OK(state_a) && IS_MODE_STATUS_OK(state_b))
+			return 0;
+
+		/*
+		 * If the retimer configuration is failed, the Nios firmware
+		 * will still release the spi controller for host to
+		 * communicate with the BMC. It makes possible for people to
+		 * reprogram a new Nios firmware and restore the card. So the
+		 * driver doesn't error out, it continues to create the spi
+		 * controller device and spi_board_info for BMC.
+		 */
+		dev_err(dev, "NIOS_INIT_DONE OK, but err on retimer init\n");
+	}
+
+	dev_err(nn->dev, "PKVL_A_MODE_STS 0x%x\n", state_a);
+	dev_err(nn->dev, "PKVL_B_MODE_STS 0x%x\n", state_b);
+
+	return ret;
+}
+
+static struct spi_board_info m10_n3000_info = {
+	.modalias = "m10-n3000",
+	.max_speed_hz = 12500000,
+	.bus_num = 0,
+	.chip_select = 0,
+};
+
+static int create_altera_spi_controller(struct n3000_nios *nn)
+{
+	struct altera_spi_platform_data pdata = { 0 };
+	struct platform_device_info pdevinfo = { 0 };
+	void __iomem *base = nn->base;
+	u64 v;
+
+	v = readq(base + N3000_NS_PARAM);
+
+	pdata.mode_bits = SPI_CS_HIGH;
+	if (FIELD_GET(N3000_NS_PARAM_CLK_POL, v))
+		pdata.mode_bits |= SPI_CPOL;
+	if (FIELD_GET(N3000_NS_PARAM_CLK_PHASE, v))
+		pdata.mode_bits |= SPI_CPHA;
+
+	pdata.num_chipselect = FIELD_GET(N3000_NS_PARAM_NUM_CS, v);
+	pdata.bits_per_word_mask =
+		SPI_BPW_RANGE_MASK(1, FIELD_GET(N3000_NS_PARAM_DATA_WIDTH, v));
+
+	pdata.num_devices = 1;
+	pdata.devices = &m10_n3000_info;
+
+	dev_dbg(nn->dev, "%s cs %u bpm 0x%x mode 0x%x\n", __func__,
+		pdata.num_chipselect, pdata.bits_per_word_mask,
+		pdata.mode_bits);
+
+	pdevinfo.name = "subdev_spi_altera";
+	pdevinfo.id = PLATFORM_DEVID_AUTO;
+	pdevinfo.parent = nn->dev;
+	pdevinfo.data = &pdata;
+	pdevinfo.size_data = sizeof(pdata);
+
+	nn->altera_spi = platform_device_register_full(&pdevinfo);
+	return PTR_ERR_OR_ZERO(nn->altera_spi);
+}
+
+static void destroy_altera_spi_controller(struct n3000_nios *nn)
+{
+	platform_device_unregister(nn->altera_spi);
+}
+
+static int n3000_nios_poll_stat_timeout(void __iomem *base, u64 *v)
+{
+	int loops;
+
+	/*
+	 * We don't use the time based timeout here for performance.
+	 *
+	 * The regbus read/write is on the critical path of Intel PAC N3000
+	 * image programing. The time based timeout checking will add too much
+	 * overhead on it. Usually the state changes in 1 or 2 loops on the
+	 * test server, and we set 10000 times loop here for safety.
+	 */
+	for (loops = N3000_NIOS_REGBUS_RETRY_COUNT; loops > 0 ; loops--) {
+		*v = readq(base + N3000_NS_STAT);
+		if (*v & N3000_NS_STAT_RW_VAL)
+			break;
+		cpu_relax();
+	}
+
+	return (loops > 0) ? 0 : -ETIMEDOUT;
+}
+
+static int n3000_nios_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct n3000_nios *nn = context;
+	u64 v;
+	int ret;
+
+	v = FIELD_PREP(N3000_NS_CTRL_CMD_MSK, N3000_NS_CTRL_CMD_WR) |
+	    FIELD_PREP(N3000_NS_CTRL_ADDR, reg) |
+	    FIELD_PREP(N3000_NS_CTRL_WR_DATA, val);
+	writeq(v, nn->base + N3000_NS_CTRL);
+
+	ret = n3000_nios_poll_stat_timeout(nn->base, &v);
+	if (ret)
+		dev_err(nn->dev, "fail to write reg 0x%x val 0x%x: %d\n",
+			reg, val, ret);
+
+	return ret;
+}
+
+static int n3000_nios_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct n3000_nios *nn = context;
+	u64 v;
+	int ret;
+
+	v = FIELD_PREP(N3000_NS_CTRL_CMD_MSK, N3000_NS_CTRL_CMD_RD) |
+	    FIELD_PREP(N3000_NS_CTRL_ADDR, reg);
+	writeq(v, nn->base + N3000_NS_CTRL);
+
+	ret = n3000_nios_poll_stat_timeout(nn->base, &v);
+	if (ret)
+		dev_err(nn->dev, "fail to read reg 0x%x: %d\n", reg, ret);
+	else
+		*val = FIELD_GET(N3000_NS_STAT_RD_DATA, v);
+
+	return ret;
+}
+
+static const struct regmap_config n3000_nios_regbus_cfg = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.fast_io = true,
+
+	.reg_write = n3000_nios_reg_write,
+	.reg_read = n3000_nios_reg_read,
+};
+
+static int n3000_nios_probe(struct dfl_device *ddev)
+{
+	struct device *dev = &ddev->dev;
+	struct n3000_nios *nn;
+	int ret;
+
+	nn = devm_kzalloc(dev, sizeof(*nn), GFP_KERNEL);
+	if (!nn)
+		return -ENOMEM;
+
+	dev_set_drvdata(&ddev->dev, nn);
+
+	nn->dev = dev;
+
+	nn->base = devm_ioremap_resource(&ddev->dev, &ddev->mmio_res);
+	if (IS_ERR(nn->base))
+		return PTR_ERR(nn->base);
+
+	nn->regmap = devm_regmap_init(dev, NULL, nn, &n3000_nios_regbus_cfg);
+	if (IS_ERR(nn->regmap))
+		return PTR_ERR(nn->regmap);
+
+	ret = n3000_nios_init_done_check(nn);
+	if (ret)
+		return ret;
+
+	ret = create_altera_spi_controller(nn);
+	if (ret)
+		dev_err(dev, "altera spi controller create failed: %d\n", ret);
+
+	return ret;
+}
+
+static void n3000_nios_remove(struct dfl_device *ddev)
+{
+	struct n3000_nios *nn = dev_get_drvdata(&ddev->dev);
+
+	destroy_altera_spi_controller(nn);
+}
+
+#define FME_FEATURE_ID_N3000_NIOS	0xd
+
+static const struct dfl_device_id n3000_nios_ids[] = {
+	{ FME_ID, FME_FEATURE_ID_N3000_NIOS },
+	{ }
+};
+MODULE_DEVICE_TABLE(dfl, n3000_nios_ids);
+
+static struct dfl_driver n3000_nios_driver = {
+	.drv	= {
+		.name       = "dfl-n3000-nios",
+		.dev_groups = n3000_nios_groups,
+	},
+	.id_table = n3000_nios_ids,
+	.probe   = n3000_nios_probe,
+	.remove  = n3000_nios_remove,
+};
+
+module_dfl_driver(n3000_nios_driver);
+
+MODULE_DESCRIPTION("Driver for Nios private feature on Intel PAC N3000");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
